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Finding the Fourth Proportional to 108.73, 162.82 and 74.40

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Solution

The fourth proportional to 108.73, 162.82 and 74.40 is: 111.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.73 : 162.82 = 74.40 : x
  2. Step 2: Convert to fraction form
    108.73/162.82 = 74.40/x
  3. Step 3: Cross multiply
    108.73x = 162.82 × 74.40
  4. Step 4: Simplify right side
    108.73x = 12,113.81
  5. Step 5: Solve for x
    x = 12,113.81/108.73
  6. Step 6: Final answer
    x = 111.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.